I've noticed that companion apps seem to have the ability to pass user entered data to a data field. For example R.485's companion app can encode waypoints (https://apps.garmin.com/en-RO/apps/a71f9445-0ed3-4d94-8756-bbc4fb578746#0) into a text string, then if you go into the Connect IQ app you can paste this string into the app's settings "track code". You then sync this to your device and that data field gets the waypoints. Is this technique documented somewhere?
Thanks